mineral

Quartz crystal cluster

Quartz (silicon dioxide, SiO₂), likely milky or iron-stained quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; colorless to milky white with translucent crystals, vitreous luster, and typically hexagonal crystal forms. Quartz has no cleavage, but produces conchoidal fracture; the dark base may be matrix or inclusions such as iron oxides or mica.

Identified September 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids or groundwater precipitate in cavities, veins, and fractures, commonly alongside igneous or metamorphic rocks. Individual crystals may be geologically young or hundreds of millions of years old; age cannot be determined from the photograph.

Uses & applications

Used for ornamental specimens, lapidary work, countertops, glass, electronics, and industrial silica. This rough cluster is mainly a decorative or collecting specimen rather than a gemstone.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, generating an electrical charge when mechanically stressed.

Field identification & locations

Identify it by its glassy luster, translucent appearance, lack of cleavage, and ability to scratch ordinary glass. Common sources include Brazil, Madagascar, the United States, and worldwide hydrothermal vein environments.